Mold registration apparatus

Abstract

A locating core for sand molds, has a larger diameter frusto-conical upper portion and a smaller diameter frusto-conical lower portion which are joined together at the bases. A mold cope and drag each have two conical depressions therein adapted to receive the upper and lower portions of the locating core respectively and positioned so that the mold cavities in the cope and drag are in proper registration when the depressions are in registration. A step is formed on the core between the diameters of the bases at the junction of the upper and lower cone portions. The step rests on the upper surface of the drag when the core is set in the drag depressions and the cope is then placed so that the cope depressions engage the upper conical portions, whereby the cope and drag mold cavities are in registration.

What is claimed is: 
     
       1. A sand mold assembly defining a mold cavity, comprising a cope portion of the mold   a drag portion of the mold, said cope and drag portions having planar surfaces surrounding the mold cavities therein, said surfaces lying in a mold parting plane when said cope and drag are assembled to define the mold cavity,   a locating core having a first truncated cone portion and a second truncated cone portion, said first portion having a base larger than the base of said second portion, said first and second portions being joined at said bases, whereby a peripheral step is formed on said core at the junction of said first and second cone portions,   said cope and drag portions of the mold each having at least two depressions formed within the mold material and shaped to receive said first and second truncated cone portions respectively,   said cone portions having height dimensions which are less than said depression depth dimensions, so that said peripheral step rests on said drag planar surface and said cope and drag surfaces are in abutting contact in said mold parting plane.   
     
     
       2. A sand mold assembly as in claim 1 wherein the cope and drag mold portions are formed of a mixture of mold sand and thermal setting resin, said core comprising a formation of mold sand and thermal setting resin. 
     
     
       3. A sand mold assembly as in claim 1 wherein the cope and drag mold portions are formed of a mixture of mold sand and gas setting resin, said core comprising a formation of mold sand and gas setting resin. 
     
     
       4. A sand mold and locating core assembly providing proper registration between mold cavities in a cope and a drag in a sand mold, wherein the cope and drag each have planar surfaces surrounding the mold cavities therein, comprising at least two frusto-conical depressions within the mold material and extending inwardly in the cope and drag from each of the planar surfaces surrounding the mold cavities, said depressions in the cope having a larger maximum diameter than said depressions in the drag and being in registration therewith when the cope is properly oriented over the drag to thereby form matching sets of depressions, and a locating core to be received in each set of registered depressions, said core including an upper frusto-conical portion and a lower frusto-conical portion, said upper portion having a larger base diameter than said lower portion, said conical portions being joined at the bases thereof, whereby a unitary core is formed and a step on said unitary core extending from the periphery of the base of said lower portion to the periphery of the base of said upper portion, said step being disposed to rest on the planar surface surrounding the drag mold cavity. 
     
     
       5. A sand mold and locating core assembly as in claim 4 wherein said frusto-conical portions comprise truncated cones of lesser height than the depths of the depressions. 
     
     
       6. A sand mold and locating core assembly as in claim 4 wherein said frusto-conical portions comprise a formation of mold sand and bonding agent.